Merge pull request 'Recursive, parallel crawl' (#11) from recursive-crawl into main

Reviewed-on: https://yerbamate.ml/LemmyNet/lemmy-stats-crawler/pulls/11

Cargo.lock

@@ -205,6 +205,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.57"
@@ -220,6 +229,17 @@ dependencies = [
  "event-listener",
 ]
 
+[[package]]
+name = "async-recursion"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2cda8f4bcc10624c4e85bc66b3f452cca98cfa5ca002dc83a16aad2367641bea"
+dependencies = [
+ "proc-macro2 1.0.37",
+ "quote 1.0.18",
+ "syn 1.0.92",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.53"
@@ -433,26 +453,17 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "3.1.15"
+version = "2.34.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85a35a599b11c089a7f49105658d089b8f2cf0882993c17daf6de15285c2c35d"
+checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
 dependencies = [
+ "ansi_term",
  "atty",
  "bitflags",
- "clap_lex",
+ "strsim 0.8.0",
- "indexmap",
- "strsim",
- "termcolor",
  "textwrap",
-]
+ "unicode-width",
-
+ "vec_map",
-[[package]]
-name = "clap_lex"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a37c35f1112dad5e6e0b1adaff798507497a18fceeb30cceb3bae7d1427b9213"
-dependencies = [
- "os_str_bytes",
 ]
 
 [[package]]
@@ -545,7 +556,7 @@ dependencies = [
  "ident_case",
  "proc-macro2 1.0.37",
  "quote 1.0.18",
- "strsim",
+ "strsim 0.10.0",
  "syn 1.0.92",
 ]
 
@@ -560,6 +571,17 @@ dependencies = [
  "syn 1.0.92",
 ]
 
+[[package]]
+name = "derive-new"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3418329ca0ad70234b9735dc4ceed10af4df60eff9c8e7b06cb5e520d92c3535"
+dependencies = [
+ "proc-macro2 1.0.37",
+ "quote 1.0.18",
+ "syn 1.0.92",
+]
+
 [[package]]
 name = "derive_more"
 version = "0.99.17"
@@ -1008,6 +1030,15 @@ version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
 
+[[package]]
+name = "heck"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
+dependencies = [
+ "unicode-segmentation",
+]
+
 [[package]]
 name = "heck"
 version = "0.4.0"
@@ -1295,14 +1326,18 @@ name = "lemmy-stats-crawler"
 version = "0.1.0"
 dependencies = [
  "anyhow",
- "clap",
+ "async-recursion",
+ "derive-new",
  "futures",
  "lemmy_api_common",
+ "log",
  "once_cell",
  "reqwest",
  "semver",
  "serde",
  "serde_json",
+ "stderrlog",
+ "structopt",
  "tokio",
 ]
 
@@ -1806,12 +1841,6 @@ dependencies = [
  "vcpkg",
 ]
 
-[[package]]
-name = "os_str_bytes"
-version = "6.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
-
 [[package]]
 name = "parking_lot"
 version = "0.11.2"
@@ -2040,6 +2069,30 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2 1.0.37",
+ "quote 1.0.18",
+ "syn 1.0.92",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2 1.0.37",
+ "quote 1.0.18",
+ "version_check",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "0.4.30"
@@ -2587,6 +2640,19 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
 
+[[package]]
+name = "stderrlog"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45a53e2eff3e94a019afa6265e8ee04cb05b9d33fe9f5078b14e4e391d155a38"
+dependencies = [
+ "atty",
+ "chrono",
+ "log",
+ "termcolor",
+ "thread_local",
+]
+
 [[package]]
 name = "string_cache"
 version = "0.8.4"
@@ -2613,12 +2679,42 @@ dependencies = [
  "quote 1.0.18",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
 [[package]]
 name = "strsim"
 version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
+[[package]]
+name = "structopt"
+version = "0.3.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c6b5c64445ba8094a6ab0c3cd2ad323e07171012d9c98b0b15651daf1787a10"
+dependencies = [
+ "clap",
+ "lazy_static",
+ "structopt-derive",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.4.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
+dependencies = [
+ "heck 0.3.3",
+ "proc-macro-error",
+ "proc-macro2 1.0.37",
+ "quote 1.0.18",
+ "syn 1.0.92",
+]
+
 [[package]]
 name = "strum"
 version = "0.24.0"
@@ -2631,7 +2727,7 @@ version = "0.24.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6878079b17446e4d3eba6192bb0a2950d5b14f0ed8424b852310e5a94345d0ef"
 dependencies = [
- "heck",
+ "heck 0.4.0",
  "proc-macro2 1.0.37",
  "quote 1.0.18",
  "rustversion",
@@ -2705,9 +2801,12 @@ dependencies = [
 
 [[package]]
 name = "textwrap"
-version = "0.15.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1141d4d61095b28419e22cb0bbf02755f5e54e0526f97f1e3d1d160e60885fb"
+checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
+dependencies = [
+ "unicode-width",
+]
 
 [[package]]
 name = "thiserror"
@@ -2731,11 +2830,11 @@ dependencies = [
 
 [[package]]
 name = "thread_local"
-version = "1.1.4"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5516c27b78311c50bf42c071425c560ac799b11c30b31f87e3081965fe5e0180"
+checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 dependencies = [
- "once_cell",
+ "lazy_static",
 ]
 
 [[package]]
@@ -2918,9 +3017,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.3.11"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bc28f93baff38037f64e6f43d34cfa1605f27a49c34e8a04c5e78b0babf2596"
+checksum = "77be66445c4eeebb934a7340f227bfe7b338173d3f8c00a60a5a58005c9faecf"
 dependencies = [
  "sharded-slab",
  "thread_local",
@@ -2991,6 +3090,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-segmentation"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e8820f5d777f6224dc4be3632222971ac30164d4a258d595640799554ebfd99"
+
 [[package]]
 name = "unicode-width"
 version = "0.1.9"
@@ -3062,6 +3167,12 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"

Cargo.toml

@@ -11,7 +11,11 @@ anyhow = "1.0.57"
 tokio = { version = "1.18.1", features = ["macros", "rt-multi-thread"] }
 futures = "0.3.21"
 serde_json = "1.0.81"
-clap = "3.1.15"
 semver = "1.0.9"
 once_cell = "1.10.0"
 lemmy_api_common = "0.16.0"
+async-recursion = "1.0.0"
+log = "0.4.17"
+derive-new = "0.5.9"
+stderrlog = "0.5.1"
+structopt = "0.3.26"

src/crawl.rs

@@ -1,65 +1,30 @@
+use crate::CLIENT;
 use crate::REQUEST_TIMEOUT;
-use anyhow::anyhow;
 use anyhow::Error;
+use async_recursion::async_recursion;
+use futures::future::join_all;
 use lemmy_api_common::site::GetSiteResponse;
-use once_cell::sync::Lazy;
+use log::debug;
-use reqwest::Client;
 use semver::Version;
 use serde::Serialize;
-use std::collections::VecDeque;
+use std::collections::HashSet;
+use std::ops::Deref;
+use std::sync::Arc;
+use tokio::sync::Mutex;
 
-static CLIENT: Lazy<Client> = Lazy::new(Client::default);
+#[derive(new)]
+pub struct CrawlJob {
+    domain: String,
+    current_distance: i32,
+    params: Arc<CrawlParams>,
+}
 
-pub async fn crawl(
+#[derive(new)]
-    start_instances: Vec<String>,
+pub struct CrawlParams {
-    exclude: Vec<String>,
+    min_lemmy_version: Version,
+    exclude_domains: Vec<String>,
     max_depth: i32,
-) -> Result<(Vec<InstanceDetails>, i32), Error> {
+    crawled_instances: Arc<Mutex<HashSet<String>>>,
-    let mut pending_instances: VecDeque<CrawlInstance> = start_instances
-        .iter()
-        .map(|s| CrawlInstance::new(s.to_string(), 0))
-        .collect();
-    let min_lemmy_version = min_lemmy_version().await?;
-    let mut crawled_instances = vec![];
-    let mut instance_details = vec![];
-    let mut failed_instances = 0;
-    while let Some(current_instance) = pending_instances.pop_back() {
-        crawled_instances.push(current_instance.domain.clone());
-        if current_instance.depth > max_depth || exclude.contains(&current_instance.domain) {
-            continue;
-        }
-        match fetch_instance_details(&current_instance.domain, &min_lemmy_version).await {
-            Ok(details) => {
-                if let Some(federated) = &details.site_info.federated_instances.as_ref() {
-                    for i in &federated.linked {
-                        let is_in_crawled = crawled_instances.contains(i);
-                        let is_in_pending = pending_instances.iter().any(|p| &p.domain == i);
-                        if !is_in_crawled && !is_in_pending {
-                            let ci = CrawlInstance::new(i.clone(), current_instance.depth + 1);
-                            pending_instances.push_back(ci);
-                        }
-                    }
-                }
-                instance_details.push(details);
-            }
-            Err(e) => {
-                failed_instances += 1;
-                eprintln!("Failed to crawl {}: {}", current_instance.domain, e)
-            }
-        }
-    }
-
-    // Sort by active monthly users descending
-    instance_details.sort_by_key(|i| {
-        i.site_info
-            .site_view
-            .as_ref()
-            .map(|s| s.counts.users_active_month)
-            .unwrap_or(0)
-    });
-    instance_details.reverse();
-
-    Ok((instance_details, failed_instances))
 }
 
 #[derive(Serialize, Debug)]
@@ -68,54 +33,65 @@ pub struct InstanceDetails {
     pub site_info: GetSiteResponse,
 }
 
-struct CrawlInstance {
+impl CrawlJob {
-    domain: String,
+    #[async_recursion]
-    depth: i32,
+    pub async fn crawl(self) -> Vec<Result<InstanceDetails, Error>> {
-}
+        // need to acquire and release mutex before recursing, otherwise it will deadlock
-
+        {
-impl CrawlInstance {
+            let mut crawled_instances = self.params.crawled_instances.deref().lock().await;
-    pub fn new(domain: String, depth: i32) -> CrawlInstance {
+            if crawled_instances.contains(&self.domain) {
-        CrawlInstance { domain, depth }
+                return vec![];
+            } else {
+                crawled_instances.insert(self.domain.clone());
             }
         }
 
-async fn fetch_instance_details(
+        if self.current_distance > self.params.max_depth
-    domain: &str,
+            || self.params.exclude_domains.contains(&self.domain)
-    min_lemmy_version: &Version,
+        {
-) -> Result<InstanceDetails, Error> {
+            return vec![];
-    let client = Client::default();
+        }
 
-    let site_info_url = format!("https://{}/api/v3/site", domain);
+        debug!("Starting crawl for {}, distance {}", &self.domain, &self.current_distance);
-    let site_info = client
+        let site_info = match self.fetch_instance_details().await {
+            Ok(o) => o,
+            Err(e) => return vec![Err(e)],
+        };
+
+        if site_info.1 < self.params.min_lemmy_version {
+            return vec![];
+        }
+
+        let mut result = vec![];
+        if let Some(federated) = &site_info.0.federated_instances {
+            for domain in federated.linked.iter() {
+                let crawl_job =
+                    CrawlJob::new(domain.clone(), self.current_distance + 1, self.params.clone());
+                result.push(crawl_job.crawl());
+            }
+        }
+
+        let mut result2: Vec<Result<InstanceDetails, Error>> =
+            join_all(result).await.into_iter().flatten().collect();
+        debug!("Successfully finished crawl for {}", &self.domain);
+        result2.push(Ok(InstanceDetails {
+            domain: self.domain,
+            site_info: site_info.0,
+        }));
+
+        result2
+    }
+
+    async fn fetch_instance_details(&self) -> Result<(GetSiteResponse, Version), Error> {
+        let site_info_url = format!("https://{}/api/v3/site", &self.domain);
+        let site_info = CLIENT
             .get(&site_info_url)
             .timeout(REQUEST_TIMEOUT)
             .send()
             .await?
             .json::<GetSiteResponse>()
             .await?;
-
         let version = Version::parse(&site_info.version)?;
-    if &version < min_lemmy_version {
+        Ok((site_info, version))
-        return Err(anyhow!("lemmy version is too old ({})", version));
     }
-
-    Ok(InstanceDetails {
-        domain: domain.to_owned(),
-        site_info,
-    })
-}
-
-/// calculate minimum allowed lemmy version based on current version. in case of current version
-/// 0.16.3, the minimum from this function is 0.15.3. this is to avoid rejecting all instances on
-/// the previous version when a major lemmy release is published.
-async fn min_lemmy_version() -> Result<Version, Error> {
-    let lemmy_version_url = "https://raw.githubusercontent.com/LemmyNet/lemmy-ansible/main/VERSION";
-    let req = CLIENT
-        .get(lemmy_version_url)
-        .timeout(REQUEST_TIMEOUT)
-        .send()
-        .await?;
-    let mut version = Version::parse(req.text().await?.trim())?;
-    version.minor -= 1;
-    Ok(version)
 }

src/lib.rs

@@ -1,9 +1,72 @@
+#[macro_use]
+extern crate derive_new;
+
+use crate::crawl::{CrawlJob, CrawlParams, InstanceDetails};
+use anyhow::Error;
+use futures::future::join_all;
+use once_cell::sync::Lazy;
+use reqwest::Client;
+use semver::Version;
+use std::collections::HashSet;
+use std::sync::Arc;
 use std::time::Duration;
+use tokio::sync::Mutex;
 
 pub mod crawl;
 
 pub const REQUEST_TIMEOUT: Duration = Duration::from_secs(10);
-pub const DEFAULT_START_INSTANCES: &str = "lemmy.ml";
+
-pub const DEFAULT_MAX_CRAWL_DEPTH: &str = "20";
+static CLIENT: Lazy<Client> = Lazy::new(Client::default);
-pub const EXCLUDE_INSTANCES: &str =
+
-    "ds9.lemmy.ml, enterprise.lemmy.ml, voyager.lemmy.ml, test.lemmy.ml";
+pub async fn start_crawl(
+    start_instances: Vec<String>,
+    exclude_domains: Vec<String>,
+    max_distance: i32,
+) -> Result<Vec<InstanceDetails>, Error> {
+    let params = Arc::new(CrawlParams::new(
+        min_lemmy_version().await?,
+        exclude_domains,
+        max_distance,
+        Arc::new(Mutex::new(HashSet::new())),
+    ));
+    let mut jobs = vec![];
+    for domain in start_instances.into_iter() {
+        let job = CrawlJob::new(domain, 0, params.clone());
+        jobs.push(job.crawl());
+    }
+
+    // TODO: log the errors
+    let mut instance_details: Vec<InstanceDetails> = join_all(jobs)
+        .await
+        .into_iter()
+        .flatten()
+        .filter_map(|r| r.ok())
+        .collect();
+
+    // Sort by active monthly users descending
+    instance_details.sort_unstable_by_key(|i| {
+        i.site_info
+            .site_view
+            .as_ref()
+            .map(|s| s.counts.users_active_month)
+            .unwrap_or(0)
+    });
+    instance_details.reverse();
+
+    Ok(instance_details)
+}
+
+/// calculate minimum allowed lemmy version based on current version. in case of current version
+/// 0.16.3, the minimum from this function is 0.15.3. this is to avoid rejecting all instances on
+/// the previous version when a major lemmy release is published.
+async fn min_lemmy_version() -> Result<Version, Error> {
+    let lemmy_version_url = "https://raw.githubusercontent.com/LemmyNet/lemmy-ansible/main/VERSION";
+    let req = CLIENT
+        .get(lemmy_version_url)
+        .timeout(REQUEST_TIMEOUT)
+        .send()
+        .await?;
+    let mut version = Version::parse(req.text().await?.trim())?;
+    version.minor -= 1;
+    Ok(version)
+}

src/main.rs

@@ -1,54 +1,55 @@
 use anyhow::Error;
-use clap::{Arg, Command};
+use lemmy_stats_crawler::crawl::InstanceDetails;
-use lemmy_stats_crawler::crawl::{crawl, InstanceDetails};
+use lemmy_stats_crawler::start_crawl;
-use lemmy_stats_crawler::{DEFAULT_MAX_CRAWL_DEPTH, DEFAULT_START_INSTANCES, EXCLUDE_INSTANCES};
 use serde::Serialize;
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+#[structopt()]
+struct Parameters {
+    #[structopt(short, long, default_value = "lemmy.ml")]
+    start_instances: Vec<String>,
+    #[structopt(short, long, default_value = "ds9.lemmy.ml, enterprise.lemmy.ml, voyager.lemmy.ml, test.lemmy.ml")]
+    exclude_instances: Vec<String>,
+    #[structopt(short, long, default_value = "20")]
+    max_crawl_distance: i32,
+
+    /// Silence all output
+    #[structopt(short, long)]
+    quiet: bool,
+    /// Verbose mode (-v, -vv, -vvv, etc)
+    #[structopt(short = "v", long = "verbose", parse(from_occurrences))]
+    verbose: usize,
+}
 
 #[tokio::main]
 pub async fn main() -> Result<(), Error> {
-    let matches = Command::new("Lemmy Stats Crawler")
+    let params = Parameters::from_args();
-        .arg(
+
-            Arg::new("start-instances")
+    stderrlog::new()
-                .long("start-instances")
+        .module(module_path!())
-                .takes_value(true),
+        .quiet(params.quiet)
-        )
+        .verbosity(params.verbose)
-        .arg(Arg::new("exclude").long("exclude").takes_value(true))
+        .init()?;
-        .arg(
-            Arg::new("max-crawl-depth")
-                .long("max-crawl-depth")
-                .takes_value(true),
-        )
-        .get_matches();
-    let start_instances: Vec<String> = matches
-        .value_of("start-instances")
-        .unwrap_or(DEFAULT_START_INSTANCES)
-        .split(',')
-        .map(|s| s.trim().to_string())
-        .collect();
-    let exclude: Vec<String> = matches
-        .value_of("exclude")
-        .unwrap_or(EXCLUDE_INSTANCES)
-        .split(',')
-        .map(|s| s.trim().to_string())
-        .collect();
-    let max_crawl_depth: i32 = matches
-        .value_of("max-crawl-depth")
-        .unwrap_or(DEFAULT_MAX_CRAWL_DEPTH)
-        .parse()?;
 
     eprintln!("Crawling...");
-    let (instance_details, failed_instances) =
+    let instance_details = start_crawl(
-        crawl(start_instances, exclude, max_crawl_depth).await?;
+        params.start_instances,
-    let total_stats = aggregate(instance_details, failed_instances);
+        params.exclude_instances,
+        params.max_crawl_distance,
+    )
+    .await?;
+    let total_stats = aggregate(instance_details);
 
     println!("{}", serde_json::to_string_pretty(&total_stats)?);
     Ok(())
 }
 
+// TODO: lemmy stores these numbers in SiteAggregates, would be good to simply use that as a member
+//       (to avoid many members). but SiteAggregates also has id, site_id fields
 #[derive(Serialize)]
 struct TotalStats {
     crawled_instances: i32,
-    failed_instances: i32,
     online_users: usize,
     total_users: i64,
     users_active_day: i64,
@@ -58,7 +59,7 @@ struct TotalStats {
     instance_details: Vec<InstanceDetails>,
 }
 
-fn aggregate(instance_details: Vec<InstanceDetails>, failed_instances: i32) -> TotalStats {
+fn aggregate(instance_details: Vec<InstanceDetails>) -> TotalStats {
     let mut online_users = 0;
     let mut total_users = 0;
     let mut users_active_day = 0;
@@ -79,7 +80,6 @@ fn aggregate(instance_details: Vec<InstanceDetails>, failed_instances: i32) -> T
     }
     TotalStats {
         crawled_instances,
-        failed_instances,
         online_users,
         total_users,
         users_active_day,